Duplicate Content: Causes, Impact, and How to Fix It

Duplicate content confuses search engines. Which URL should rank? They may choose none, or the wrong one. Here’s how to fix it.

Common Causes

• URL parameters — ?sort=, ?filter=, ?session=. Same content, multiple URLs.
• WWW vs. non-WWW — Two URLs for every page. Pick one, redirect the other.
• Print and PDF — Same content, different format. Canonical or noindex the duplicate.
• Thin pages — “Location: City A” with 50 words. Consolidate or noindex.

Solutions

• Canonical tags — Point duplicate URLs to the preferred version. rel=“canonical”.
• 301 redirects — If the duplicate has no value, redirect to the canonical.
• Noindex — For pages you need to exist but don’t want indexed. Use sparingly.
• Consolidate — Merge thin pages into one strong page. 301 the rest.

Parameter Handling

• Google Search Console — Use URL Parameters tool to tell Google to ignore certain parameters.
• Canonical — Ensure the canonical URL doesn’t include parameters.

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